﻿/*
 * Twipler - Twitter Web Client with features.
 *  
 *  Copyright (C) 2009, 2010. Ian Quigley
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details. 
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Twipler.App.DataDoc;

namespace Twipler.App.Machine.Instructions
{
    [InstructionAttibute("Call IDataDoc.Find", pushes = 1)]
    public class DocVal : App.Machine.Instruction
    {
        private string _varname;
        private string _find;

        public DocVal(string varname, string find)
        {
            _varname = varname;
            _find = find;
        }

        public override void Exec(Environment env)
        {
            IDataDoc datadoc = env.Variables_Get(_varname) as IDataDoc;

            if (datadoc == null)
                env.Stack.Push(null);
            else
            {
                DataDocValue val = datadoc.Find(_find);
                if (val == null)
                    env.Stack.Push(null);
                else
                    env.Stack.Push(val.Value);
            }
        }

		public override string ToString()
		{
			return string.Format("docval {0}, \"{1}\"", _varname, _find);
		}
    }
}